style.css

.video-container {
    display: flex;
    justify-content: center;
    align-items: center;
}

.video-item {
    width: 300px;
    height: 300px;
    max-width: 300px !important;
    align-items: center;
}
#sidebar {
    max-width: 500px !important;
    max-height: 500px !important;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
}
.sidebar-item {
    max-width: 100px !important;
}
.result {
    margin: auto;
}
#right-side {
    margin: 0 50px !important;
}

#tgt-caption {
    align-items: center;
}